Roll structure for dry-wood-bending machines



kb 17; 1931- T. R. LIVINGSTON 1,792,597

ROLL STRUCTURE FOR DRY WOOD BENDING MACHINES Filed Sept. 8, 1928 Tiff.

gwwntoz PatenleclFeb.` 17, 1931" UNITED ISTAlEsPatria1\11 OFFICE TROYV n nivncsmon, KoirMrfivoIn,I/ismnnn,4 Assienon, Bi( Mnsniii ASSIGNMENTS,

Y To THE DELPHOS BENniNG COMPANY, oF'DnLPHos, OHIO, iA CORPORATION OFl OHIO."`

ROLL STRUCTURE non DRY-wooD-Bnnmne `ivrncmnns Application filed September 8," 1928. Serial No. 304,669.

- Y My invention' relates `to. a lroll,structure,

especially adapted for use in theheated `rolls of dry-wood bending machines` of the. character shown in Patents Nos, 960,525 and '6, 1,507,368, granted to Charles WV. `Elliott on,

June 7, 1910, and September 2, 1924:, respectively. y

Insuch dry wood bending machines, there is a heated roll which ,is heated internally,

" .usually by gas flames, and which is mounted markedly as the result of stresseswithin the roll itself. As the heated roll is acomposite structure, with a cylindrical peripheral member and separate supporting end mem-V 1bers,the stresses which-are produced make f Ordinary fastening devices, such as screws,

practically impossible as permanent attach- Y i ing members; because such screws workloose ina relatively short space oftime.

It'is Vthe object of my present,y invention to l provide a roll structure in which the attach- ,Y ing means between the parts ofthe roll Vwill notbecome loose in operation, and in which thechanges in hsize .andshape due to changing temperatures are not opposed bythe attaching means b ut'arepermitted, to work `themselves out harmlessly, i

The accompanying drawing inlstmtes my.

invention: Fig; 1 is a transversevertical secs tion, `substantially on .the line 1,-.-1 of'llig. 2, of a fragmentofa dry-wood bending ,ma-V chine, having a heated-roll structure, embodying my invention; and Fig.v 2' is a llongi-` i siibstantiallyon theline 2-2 of 1.

The dry-wood bending machine has al heat-` ed roll 11 Vwhich co-operat-es with two sup-. lplemeiital rolls 12 andr13 to; produce bend-lV ingof strips of woord 14, as theyare vfed .through the machine. lhexheated roll k11 Y acts on the side ofthewoodwhichfis to'be concave,andthe other two rolls actjpn the otherside of-thewood. One of the rolls, rdesirablyfthe heated rollpis suitablypower:

, tudinal section through thefheated roll, taken driven, for which purpose it has a driving gear 15.. rlhe action ofthe rolls may be supplemented. by a flexible sheet of metal 16 which extends between thev rollers 12 and .13 and the wood strips` 14;. and by pressure .rollers 17 which act against theouterface of .the metal sheet 16 at about the place where the bending of the wood starts, which is between the two rollers-12and 13.

The rollersll, 12, and 13 are allcarried by a supporting frame 18, so that they may rotateto feed the woodl/ithrough from left to right;(Fig. 1'). Y i Y A Y The heated roll 11 isheated by the flames from a gas burner 21, which' is conveniently a gas pipe with vsuitable holes through it for the flames. This gas pipe is supported by` a `stationary rod orpipe 22located on the axis of vthe roll 11 and supplying the gas to the burner 21. T herrod or pipe22 is stationarily. supportedfrom the frame 18, and furnishes the bearing support for the heated roll 11.`

As thus far generally described, the structure iS known. My invention relates vto the structure of the roll itself. s Y

v Theheated roll 11 comprises a cylinder 25, which Vbears againstY the surface of ,the wood strip 14; VThis cylinder 25 is of suitable metal, sutliciently heavy to'eXert thenecessary pressure; and may be made as a casting or forging or as a length` ofv standardheavy tubing. The lcylinder 25 4is carried by two endmembers 26 and 27, which havebearing support on therod or pipe 22 lwith interposed bushings 28 if desired. -AThe endfmem-V ber 27 is desirably of onev piece with the gear and abutfagainst the inner surface thereof, The spaces between'the'spokes, atleas't those of the end member26 which doesl not carry Vthe gear thoughif desired also betweenthose of the end member 27, areopen spaces, to provide o ntletgpassages Ifrom the .roll for theV products of fcombustion from the gas'iiames.

V15."YThe'endmeniliers 26 and 27have=out V-wardly projecting radial spokes 30 and 31,v which fit within-the ends ofthe cylinder 25 The. spokes 3(7)'.and -31 support the cylinder atpoints sufficiently angular-lyv closejto pre- Y 1vent any marked distortion of'such cylinder;

such as might occur bythe :collapsing ofthe cylinder between spokes if the spokes were too far apart.

Registering radial holes are drilled in the cylinder and in. the ends of some of the spokes and 3l. Conveniently such holes are provided in alternate spokes, as is clear from Fig. l; and those spokes are in consequence conveniently made thicker than the other set of alternate spokes. ln lthese radial holes are set plugs 35, which extend in radially and do not interfere with any relative radial movement between the spoke 3() or 31. and the superposed portion of the cylinder 25, such as may occur upon differential heating of the cylinder and end members. That is, the plugs have in the holes which receive them, or at least in the holes in the cylinder 25, a fit which is sufficiently loose to permit sliding; although that does not need to be very loose, on account'of the tremendous stresses which aie involved in heating and cooling. Near their inner ends, each plug 35 is provided with a circumferential groove 36,' which receives the inner end of a screw plug 37 which is screw-mounted in the spoke 30 or 31 that carries the associated pin 35 and projects parallel to the axis of the roller or perpendicular to the pin 35.

It is found that this construction makes a permanent attachment between the end members 26 and 27 and the cylinder 25, which does not become loose in use. That is, the pins 35 are not subjected to stresses, as screws would be, from differential expansion and contraction of the cylinder 25 and of such end members but permit free radial movement between such end members and the cylinder 25, while providing between them an attachment entirely suiiicient to transmit any torques encountered in practice.

If it is desired to take the roll apart, as for inspection or repair, this can readily be done by first removing the screw plugs 37 and then liftingout the pins 35.

I claim asv my invention:

l. A i'oll structure, comprising a cylinder, end members fitting within the ends of the cylinder, said end members and the overlying parts of the cylinder having registering holes, pins set in said holes to hold the cylinder and end members together while permittin radial movement between them, said pins being' provided with circumferential grooves, and means mounted in the end members and projecting into said circumferential groove to hold the pins in place.

2. A roll structure, comprising a cylinder, end members fitting within the ends of the cylinder, said end members and the overlying parts of the cylinder having registering holes, pins set in saidholes to hold the cylinder and end members together while permitting radial I movement betweenthem, said pins being provided with circumferential grooves, and screw plugs mounted in the end members and projecting into said circumferential groove to hold the pins in place.

3. A heated-roll structure for dry-wood bending machines, comprising two end members for rotatably mounting on a supporting rod, a driving gear integral with one of said end members, said end members being provided with radially projecting spokes, a cylinder within the ends of which said spokes lie so that said spokes abut against the inner surface of the cylinder, the ends of one or more of the spokes and the cylinder being Vprovided with registering holes, pins set in said holes and permitting free relative radial movement of the cylinder and spokes upon differential expansion and contraction due to heating and cooling, said pins being provided with circumferential grooves, and means mounted in the spokes for engaging said grooves to hold the pins radially in place in the spokes.

4. A heated-roll structure for dry-wood bending machines, comprising two end members for rotatably mounting on a supporting rod, a driving gear integral with one of said end members, said end members being provided with radially projecting spokes, a cylinder within the ends of which said spokes lie so that said spokes abut against the inner surface of the cylinder, the ends of one or more of the spokes and the cylinder being provided with registering holes, pins set in said holes and permitting free relative radial movement of the cylinder and spokes upon differential expansion and contraction due to heating and cooling, said pins being provided with circumferential grooves, and screwplugs mounted in the spokes for engaging said grooves to hold the pins radially in place in the spokes.

5. In a roll structure, a hollow cylinder and end members fitting within the ends of the cylinder, said end members and the overlying parts of the cylinder having register-V ing holes extending radially of said cylinder, said holes being of uniform cross-section, and pins located in said registering holes in the en d members and cylinder, each of the pins being secured to one of said parts and being of uniform cross-section where it is received in the other part in order to permit relative radial movement of the cylinder and end members while holding them in definite angular relation.

G. In a heated-roll structure, a hollow cylinder, an end member Vin one end of said cylinder having a driving gear integral with itself, an end member in the other end of said cylinder, radially projecting spokes on said end-members abutting the inn'er surface of `said cylinder, one or more of the spokes and the over-lying parts ,of the cylinder being provided with registering holes of uniform cross-section, and pins fitted in said holes. each of said pins being fastened in one of said parts and being of uniform cross-section Where itis received by the other part in order to permit relative radial movement-of the cylinder and the end members While holding them in definite angular'position.

7 A v roll structure, comprising a hollow cylinder, a driving end'member vfor said cylinder adapted to be rotatably mounted, another end member for said cylinder, means operatively connecting said driving end member and said cylinder, said connecting means including a radially extending pin carried by one of said inter-connected parts and fitted in a hole of uniform cross-section in the other of said interconnected parts in order to per-1 mit relative radial movementof said interconnected parts While holding them in definite angular adjustment.

In Witness whereof, I, T. R.Y LrvINGsToN, have hereunto setmy handfat Muncie, Indiana, this 5th day of September, A. D. one thousand nine hundred and twenty-eight.

' TROY R. LIVINGSTON. 

